Alexis P. Lamberts Allan K. Clark Robert R. Morris 20250709 vector digital data Denver, Colorado U.S. Geological Survey https://doi.org/10.5066/P13BICJ5 Allan K. Clark Alexis P. Lamberts Robert R. Morris 2025 map Scientific Investigations Map SIM 3540 Reston, Virginia U.S. Geological Survey In cooperation with Edwards Aquifer Authority https://doi.org/10.3133/sim3540 The karstic Edwards and Trinity aquifers are classified as major sources of water in south-central Texas by the Texas Water Development Board, and both are classified as major aquifers by the State of Texas. The Edwards and Trinity aquifers developed because of the original depositional history of the carbonate limestone and dolomite rocks that contain them, and the primary and secondary porosity, diagenesis, fracturing, and faulting that modified the porosity, permeability, and transmissivity of each aquifer and of the geologic units separating the aquifers. Previous studies such as those by the U.S. Geological Survey (USGS) and the Edwards Aquifer Authority (EAA) have mapped the geology, hydrostratigraphy, and structure in these areas at various scales. The purpose of this data release is to present the data that were collected and compiled to describe the geologic framework and hydrostratigraphy within Hays County, Texas in order to help water managers, water purveyors, and local residents better understand and manage water resources. The scope of the larger work and this accompanying data release is focused on the geologic framework and hydrostratigraphy of the outcrops and hydrostratigraphy of the rocks that contain the Edwards and Trinity aquifers within Hays County, Texas. These digital data are a revision to a previous publication of the geologic framework and hydrostratigraphy of the Edwards and Trinity aquifers that was completed in 2018 within Hays County, Texas. These digital data accompany USGS Scientific Investigations Map 3540 (Clark and others, 2025), which supersedes USGS Scientific Investigations Map 3418. These data are intended to illustrate the geographical extent of the surficial hydrostratigraphic units and faulting within the 560 square mile study area in Hays County, Tex. These digital data accompany Clark and others (2025). 2016 2024 publication date Complete None planned -98.2976 -97.8203 30.3563 29.8130 ISO 19115 Topic Category geoscientificInformation imageryBaseMapsEarthCover None Austin Group Balcones fault zone Corbula bed Eagle Ford Group Edwards aquifer Edwards Group fault Person Formation Kainer Formation lithology Loriolia bed lower member of the Glen Rose Limestone Taylor Group Trinity aquifer Trinity Group upper member of the Glen Rose Limestone Washita Group Pecan Gap Chalk Buda Limestone Del Rio Clay Georgetown Formation Pearsall Formation Hosston Formation USGS Thesaurus digitization geospatial datasets geologic maps geography geology hydrogeology stratigraphy geologic contacts surficial geologic units stratigraphic thickness porosity groundwater Cretaceous karst geospatial analysis data integration lithostratigraphy land surface characteristics fracture faulting USGS Metadata Identifier USGS:661ff2dbd34e7eb9eb7ed3b2 U.S. Board on Geographic Names (BGN) Barton Creek Blanco River Buda City of Dripping Springs Hays County Kyle Little Blanco River San Marcos San Marcos River Texas Wimberley Please see 'Distribution Info' for details. None. Users of these data are advised to read all metadata and associated documentation thoroughly to understand appropriate use and data limitations. U.S. Geological Survey Oklahoma-Texas Water Science Center Public Information Officer mailing and physical

1505 Ferguson Lane

Austin Texas 78754 (512) 927-3500 otpublicinfo@usgs.gov Microsoft Windows 10 Version 10.0 (Build 19044); Esri ArcGIS Pro 3.2 Data were collected in the field with the use of geolocation enabled devices. While in the field, mapping attributes were tagged to waypoints (specific latitudes and longitudes and other reference points). Authors have reviewed the attributes for accuracy and completeness through visual inspection in a geospatial information system (GIS). Newly mapped data and their associated attributes were compared against previously published mapping reports. Map elements were visually checked for errors during the use of GIS software, including overshoots, undershoots, duplicate features, and other errors. ArcGIS software was used to create topological relationships among features. Features were not duplicated, but coincident lines may exist between data layers where appropriate. Newly mapped hydrostratigraphic units were field mapped and digitized for display at a 1:24,000 scale. Data are complete; no features were eliminated or generalized. The hydrostratigraphic map unit properties are described in the companion Scientific Investigations Map 3540. Charles D. Blome Jason R. Faith Diana E. Pedraza George B. Ozuna J.C. Cole Allan K. Clark Ted A. Small Robert R. Morris 2005 1.1 map U.S. Geological Survey Scientific Investigations Map 2873 Denver, Colorado U.S. Geological Survey 1 sheet; In cooperation with the National Cooperative Geologic Mapping Program https://doi.org/10.3133/sim2873 200000 Digital and/or Hardcopy 1994 2003 publication date Blome and others (2005) Provides the geologic digital dataset used as a base. Ted A. Small John A. Hanson Nico M. Hauwert 1996 1.0 document Water-Resources Investigations Report 96-4306 Austin, Texas U.S. Geological Survey 15p.; 1 plate; In cooperation with the Barton Springs, Edwards Aquifer Conservation District, and the Texas Water Development Board https://doi.org/10.3133/wri964306 75000 Digital and/or Hardcopy 1996 publication date Small and others (1996) Provides geologic information used in mapping. John A. Hanson Ted A. Small 1995 1.0 document Water-Resources Investigations Report 95-4265 Austin, Texas U.S. Geological Survey 10p.; 1 plate; In cooperation with the Edwards Underground Water District https://doi.org/10.3133/wri954265 75000 Digital and/or Hardcopy 1995 publication date Hanson and Small (1995) Provides geologic information used in mapping. Allan K. Clark James A. Golab Robert R. Morris 2016 1.0 map U.S. Geological Survey Scientific Investigations Map 3366 Reston, Virginia U.S. Geological Survey 1 sheet; pamphlet; Prepared in cooperation with the Edwards Aquifer Authority https://doi.org/10.3133/sim3366 24000 Digital and/or Hardcopy 2016 publication date Clark and others (2016a) Provides geologic information used in mapping. Allan K. Clark Charles D. Blome Robert R. Morris 2014 1.0 map U.S. Geological Survey Scientific Investigations Map 3303 Reston, Virginia U.S. Geological Survey 8p.; 1 sheet http://doi.org/10.3133/sim3303 Digital and/or Hardcopy 2014 publication date Clark and others (2014) Provides geologic information used in mapping. Amy R. Clark Charles D. Blome Jason R. Faith 2009 1.0 map Open-File Report 2009-1008 Denver, Colorado U.S. Geological Survey 24p.; 1 plate https://doi.org/10.3133/ofr20091008 Digital and/or Hardcopy 2009 publication date Clark and others (2009) Provides geologic information used in mapping. Allan K. Clark James A. Golab Robert E. Morris 2016 1.1 map U.S. Geological Survey Scientific Investigations Map 3363 Reston, Virginia U.S. Geological Survey 1 plate; pamphlet; table; figure; metadata; spatial data https://doi.org/10.3133/sim3363 24000 Digital and/or Hardcopy 2016 publication date Clark and others (2016b) Provides geologic information used in mapping. Charles D. Blome Allan K. Clark 2014 1.0 document Data Series 768 Reston, Virginia U.S. Geological Survey 1p.; Prepared in cooperation with Camp Stanley Storage Activity, Parsons Corporation, and Weatherford Laboratories https://doi.org/10.3133/ds768 Digital and/or Hardcopy 2014 publication date Blome and Clark (2014) Provides geologic information used in mapping. William G. Stein George B. Ozuna 1995 1.0 map Water-Resources Investigations Report 95-4030 Austin, Texas U.S. Geological Survey 8p.; Prepared in cooperation with the San Antonio Water System https://doi.org/10.3133/wri954030 24000 Digital and/or Hardcopy 1995 publication date Stein and Ozuna (1995) Provides geologic information used in mapping. Allan K. Clark 2003 1.0 map Water-Resources Investigations Report 03-4081 Austin, Texas U.S. Geological Survey In cooperation with the U.S. Army https://doi.org/10.3133/wri034081 24000 Digital and/or Hardcopy 2003 publication date Clark (2003) Provides geologic information used in mapping. Allan K. Clark 2004 1.0 map U.S. Geological Survey Scientific Investigations Map 2831 Denver, Colorado U.S. Geological Survey 1 sheet; In cooperation with the U.S. Army https://doi.org/10.3133/sim2831 24000 Digital and/or Hardcopy 2004 publication date Clark (2004) Provides geologic information used in mapping. David L. Amsbury 1974 map Digital and/or Hardcopy 1974 publication date Amsbury (1974) Geologic map John B. Ashworth 1983 document Texas Department of Water Resources Report 273 Austin, Texas Texas Department of Water Resources 39 p. https://www.twdb.texas.gov/publications/reports/numbered_reports/doc/R273/Rpt273.pdf Digital and/or Hardcopy 1983 publication date Ashworth (1983) Provides information on hydrologic properties of select hydrogeologic units. Thomas E. Brown Noel B. Waechter Frith Owens Ike Howeth Virgil E. Barnes 1976 map Geologic Atlas of Texas 11 Austin, Texas The University of Texas, Bureau of Economic Geology https://store.beg.utexas.edu/geologic-atlas-of-texas/326-ga0011.html 250000 Digital and/or Hardcopy 1976 publication date Brown and others (1976) Provides geologic information used in mapping. Virgil E. Barnes 1981 map Geologic Atlas of Texas 20 Austin, Texas The University of Texas, Bureau of Economic Geology https://store.beg.utexas.edu/geologic-atlas-of-texas/2102-ga0020.html 250000 Digital and/or Hardcopy 1981 publication date Barnes (1981) Provides geologic information used in mapping. Philip W. Choquette Lloyd C. Pray 1970 tabular digital data American Association of Petroleum Geologists Bulletin v. 54, no. 2 p.207-250 https://doi.org/10.1306/5D25C98B-16C1-11D7-8645000102C1865D Digital and/or Hardcopy 1970 publication date Choquette and Pray (1970) Provides information on porosity of select geologic units. Allan K. Clark Diana E. Pedraza Robert R. Morris 2013 document U.S. Geological Survey Scientific Investigations Report 2013-5149 Reston, Virginia US Geological Survey 36 p.; 1 plate; Prepared in cooperation with the U.S. Army Corps of Engineers https://doi.org/10.3133/sir20135149 24000 Digital and/or Hardcopy 2013 publication date Clark and others (2013) Provides geologic information used in mapping. Allan K. Clark Robert R. Morris 2015 map U.S. Geological Survey Scientific Investigations Map 3333 Reston, Virginia U.S. Geological Survey https://doi.org/10.3133/sim3333 50000 Digital and/or Hardcopy 2015 publication date Clark and Morris (2015) Provides geologic information used in mapping. Robert T. Hill 1891 document Geological Society of America Bulletin vol. 2, no. 1 Unknown Geological Society of America p. 503-528 https://doi.org/10.1130/GSAB-2-503 Digital and/or Hardcopy 1891 publication date Hill (1891) Provides description of group, formation, and members for geologic units of the Comanche series. Brian B. Hunt Brian A. Smith Allan Andrews Douglas A. Wierman Alex S. Broun Marcus O. Gary 2015 document Unknown National Cave and Karst Institute https://doi.org/10.5038/9780991000951.1081 Digital and/or Hardcopy 2015 publication date Hunt and others (2015) Provides information on the influence of structures on groundwater flow. Ralph W. Imlay 1945 tabular digital data American Association of Petroleum Geologists Bulletin v. 29, no. 10 Tulsa, Oklahoma American Association of Petroleum Geologists p. 1416-1469 https://doi.org/10.1306/3D933794-16B1-11D7-8645000102C1865D Digital and/or Hardcopy 1945 publication date Imlay (1945) Provides descriptions of formations for geologic units from the Lower Cretaceous. Richard F. Inden 1974 document Geoscience and Man v. 8 Baton Rouge, Louisiana Louisiana State University P. 37-52; In Perkins, B.F., and Amsbury, D.L., eds., Aspects of Trinity Geology Division Digital and/or Hardcopy 1974 publication date Inden (1974) Provides descriptions of the geologic units of the Trinity Group. Frank E. Lozo Fred L. Stricklin, Jr. 1956 tabular digital data Gulf Coast Association of Geological Societies Transactions v. 6 p. 67–78 Digital and/or Hardcopy 1956 publication date Lozo and Stricklin (1956) Provides descriptions of geologic and hydrostratigraphic units Robert W. Maclay Ted A. Small 1976 document U.S. Geological Survey Open-File Report 76-627 Austin, Texas U.S. Geological Survey 63 p.; Prepared in cooperation with the San Antonio City Water Board and the Texas Water Development Board https://doi.org/10.3133/ofr76627 Digital and/or Hardcopy 1976 publication date Maclay and Small (1976) Provides information on geologic unit properties and aquifer properties for the geologic units containing the Edwards aquifer. Bob F. Perkins 1974 tabular digital data Geoscience and Man v. 8 Baton Rouge, Louisiana Louisiana State University p. 131-173; In Perkins, B.F., and Amsbury, D.L. eds., Aspects of Trinity Geology--A symposium on the stratigraphy, sedimentary environments, and fauna of the Comanche Cretaceous Trinity Division (Aptian and Albian) of Texas and northern Mexico Digital and/or Hardcopy 1974 publication date Perkins (1974) Provides descriptions of the geologic units of the Glen Rose Limestone. Peter R. Rose 1972 document Report of Investigations 74 Austin, Texas The University of Texas, Bureau of Economic Geology https://doi.org/10.23867/RI0074D Digital and/or Hardcopy 1972 publication date Rose (1972) Provides descriptions of the geologic units of the Edwards Group. Peter R. Rose 2017 document Gulf Coast Association of Geological Societies Transactions v. 67 p. 637-638 https://gcags.org/exploreanddiscover/2017/00279_rose.pdf Digital and/or Hardcopy 2017 publication date Rose (2017) Provides descriptions of hydrostratigraphic units of the Edwards Group. Fred L. Stricklin, Jr. Charles I. Smith Frank E. Lozo 1971 tabular digital data Report of Investigations v. 71 Austin, Texas The University of Texas, Bureau of Economic Geology Digital and/or Hardcopy 1971 publication date Stricklin and others (1971) Provides descriptions of the geologic units of the Trinity Group. Fred L. Stricklin, Jr. Charles I. Smith 1973 document Geological Society of America Bulletin v. 84, no. 4 p. 1349-1368 https://doi.org/10.1130/0016-7606(1973)84%3C1349:EROACB%3E2.0.CO;2 Digital and/or Hardcopy 1973 publication date Stricklin and Smith (1973) Provides descriptions of the geologic units of the Cow Creek Formation. Douglas A. Wierman Alex S. Broun Brian B. Hunt 2010 map 19 p.; Prepared by the Hays-Trinity, Barton Springs/Edwards Aquifer, and Blanco-Pedernales Groundwater Conservation Districts https://www.researchgate.net/publication/47630549_Hydrogeologic_atlas_of_the_Hill_Country_Trinity_Aquifer_Blanco_Hays_and_Travis_Counties_central_Texas Digital and/or Hardcopy 2010 publication date Wierman and others (2010) Provides mapping and descriptions of hydrogeologic features within Blanco, Hays and Travis Counties. Marion I. Whitney 1952 tabular digital data Journal of Paleontology v. 26 no. 1 Tulsa, Oklahoma Society for Sedimentary Geology (SEPM) p. 65-73 https://www.jstor.org/stable/1299772 Digital and/or Hardcopy 1952 publication date Whitney (1952) Provides descriptions of fossils found within the Glen Rose Formation. U.S. Geological Survey 2024 raster digital data Reston, Virginia U.S. Geological Survey Supported by the National Cooperative Geologic Mapping Program https://www.usgs.gov/news/historical-maps-your-fingertips https://ngmdb.usgs.gov/topoview/ 24000 Digital and/or Hardcopy 1880 2024 publication date USGS (2024) U.S. Geological Survey 7.5-minute quadrangles used as reference base maps for this mapping project: Hammetts Crossing, Tex., 1967 (1987 Edition); Shingle Hills, Tex., 1986 (1986 Edition); Yeager Creek, Tex., 1963 (1987 Edition); Henly, Tex., 1963 (1987 Edition); Dripping Springs, Tex., 1986 (1986 Edition); Signal Hill, Tex., 1986 (1995 Edition); Oak Hill, Tex., 1988 (1988 Edition); Payton, Tex., 1963 (1987 Edition); Rough Hollow, Tex., 1963 (1987 Edition); Driftwood, Tex., 1964 (1987 Edition); Mountain City, Tex., 1968 (1994 Edition); Buda, Tex., 1968 (1994 Edition); Devils Backbone, Tex., 1989 (1989 Edition); Wimberley, Tex., 1989 (1989 Edition); San Marcos North, Tex., 1995 (1998 Edition); Hunter, Tex., 1964 (1994 Edition) San Marcos; South, Tex., 1964 (1994 Edition) Robert T. Hill T. Wayland Vaughan 1898 publication Annual Report of the U.S. Geological Survey 18, part 2 Washington, D.C. U.S. Geological Survey https://doi.org/10.3133/ar18 Digital and/or Hardcopy 1898 publication date Hill and Vaughan (1898) Provides descriptions of geology and hydrologic function. Walter S. Adkins 1932 publication Bureau of Economic Geology UT Bulletin 3232 Austin, Texas University of Texas In the Geology of Texas: University of Texas, Publication 3232 p. 329-518 in Sellards, E.H., Adkins, W.C. and Plummer, F.B., eds. https://store.beg.utexas.edu/ut-bulletins/253-bl3232.html Digital and/or Hardcopy 1932 publication date Adkins (1932) Provides description of the stratigraphy of the Mesozoic systems in Texas T. Wayland Vaughan 1900 publication U.S. Geological Survey Folios of the Geologic Atlas 64 Washington, D.C. U.S. Geological Survey https://doi.org/10.3133/gf64 Digital and/or Hardcopy 1900 publication date Vaughan (1900a) Provides description of group, formation, members and unit thicknesses T. Wayland Vaughan 1900 publication Bulletin of the U.S. Geological Survey 164 Washington, D.C. U.S. Geological Survey https://doi.org/10.3133/b164 Digital and/or Hardcopy 1900 publication date Vaughan (1900b) Provides descriptions of group, formation, and members Henryk B. Stenzel 1938 publication The University of Texas Publication 3618 Austin, Texas The University of Texas https://repositories.lib.utexas.edu/handle/2152/27652 Digital and/or Hardcopy 1938 publication date Stenzel (1938) Provides description of group, formation and members Robert T. Hill 1892 tabular digital data The American Geologist vol. 10, no. 2 Minneapolis, MN The Geological Publishing Company p. 105-115 Digital and/or Hardcopy 1892 publication date Hill (1892) Provides descriptions of topography. Robert T. Hill 1888 tabular digital data None v. 11, no. 258 Unknown Science https://www.science.org/doi/10.1126/science.ns-11.258.21.a Digital and/or Hardcopy 1888 publication date Hill (1888) Provides description of group, formation and members Clyde P. Ross 1943 tabular digital data U.S. Geological Survey Bulletin 928-B Washington, D.C. U.S. Geological Survey https://doi.org/10.3133/b928B Digital and/or Hardcopy 1943 publication date Ross (1943) Provides description of group, formation and members. Geologic data and information from previously published reports (Hanson and Small, 1995; Stein and Ozuna, 1995; Small and others, 1996; Clark, 2003, Clark, 2004; Blome and others, 2005; Clark and others, 2009; Clark and others, 2014; Blome and Clark, 2014; Clark and others, 2016a; Clark and others, 2016b) were reviewed to assist in field mapping efforts. If the report had an associated digital dataset that was in or around the study boundary, the data were brought into a Geographical Information System (GIS) and plotted against digital U.S. Geological Survey 7.5-minute topographic quadrangle maps for review and analysis (USGS, 2024). Data that plotted along the borders of the study boundary were used to help guide the edge-matching process against newly collected mapping data from the field. Blome and others (2005) Small and others (1996) Hanson and Small (1995) Clark and others (2009) Clark and others (2014) Clark and others (2016b) Clark and others (2016a) Blome and Clark (2014) Stein and Ozuna (1995) Clark (2003) Clark (2004) USGS (2024) 2023 Digital U.S. Geological Survey 7.5-minute topographical quadrangle maps (USGS, 2024) were used as a field base map to aid in reconnaissance and field mapping efforts. The digital topographic quadrangles were used as the reference base map on which to make notations of identified features. USGS (2024) 2024 Waypoints of contacts between hydrostratigraphic units and fault locations were collected in the field with the use of handheld Global Positioning System (GPS) units and GPS-enabled devices. Waypoints were labeled with descriptions for the identified feature. 2024 The field identified contacts between hydrostratigraphic units and faults were digitized with the aid of a digital elevation contour dataset that aligns with the U.S. Geological Survey 7.5-minute topographical quadrangle elevation contours (USGS, 2024). Elevation contours that were coincident with field-identified contacts were traced and attributed as contact-certain. Waypoints with field identified descriptors were transferred to a map unit labeling point feature class. The digitized line work and map unit point data were then used to create a surficial geology polygon dataset. USGS (2024) 2024 Topological errors were checked and corrected for duplicate polygons and lines, gaps, overshoots, undershoots, and overlaps similar to the methods done in Blome and others (2005) and Clark and others (2016a; b). Clark and others (2016b) Blome and others (2005) Clark and others (2016a) 2024 Vector G-polygon Universal Transverse Mercator 14 0.9996 -99.0 0.0 500000.0 0.0 coordinate pair 0.6096 0.6096 meters North_American_Datum_1983 GRS 1980 6378137.0 298.257222101 Hays_Geo older containing a collection of files with a common filename prefix (Hays_Geo) associated with the feature class (shapefile; .shp) containing information for the map units. Producer Defined FID (also labeled as OBJECTID) Sequential unique whole numbers that are automatically generated for each feature. Esri 0 2681 unitless 1 Shape Feature geometry or shape type. Esri Polygon A polygon consists of one or more rings where a ring is a connected sequence of four or more points that form a closed, non-self-intersecting loop. Esri Unit_Order Number indicates the order of geologic time for the map unit from youngest to oldest. The youngest unit is designated as 1, and the oldest unit is designated as 30. Producer Defined 1 30 unitless 1 Geo_Unit_1 Abbreviation for each map unit within the project boundary. Producer defined Kpg Pecan Gap Chalk Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Ka Austin Group Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kef Eagle Ford Group Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kb Buda Limestone Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kdr Del Rio Clay Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kg Georgetown Formation Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kpcm informal cyclic and marine members (undivided) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kplc informal leached and collapsed members (undivided) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kprd informal regional dense member Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kkg informal grainstone member Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kkke Kirschberg Evaporite Member Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kkd informal dolomitic member Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kkb informal burrowed member Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kkbn informal basal nodular member Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kgrc informal cavernous hydrostratigraphic unit Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kgrcb informal Camp Bullis hydrostratigraphic unit Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kgrue informal upper evaporite hydrostratigraphic unit Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kgrf informal fossiliferous hydrostratigraphic unit Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kgrle informal lower evaporite hydrostratigraphic unit Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kgrb informal Bulverde hydrostratigraphic unit Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kgrlb informal Little Blanco hydrostratigraphic unit Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kgrts informal Twin Sisters hydrostratigraphic unit Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kgrd informal Doeppenschmidt hydrostratigraphic unit Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kgrhf informal Herff Falls hydrostratigraphic unit Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kgrr informal Rust hydrostratigraphic unit Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kgrhc informal Honey Creek hydrostratigraphic unit Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kheh Hensell Sand Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kcccc Cow Creek Limestone Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Khah Hammett Shale Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Ksys Sycamore Sand Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Geo_Unit_2 Common name of each map unit within the project boundary. Producer defined Pecan Gap Chalk Pecan Gap Chalk (Kpg) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Austin Group Austin Group (Ka) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Eagle Ford Group Eagle Ford Group (Kef) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Buda Limestone Buda Limestone (Kb) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Del Rio Clay Del Rio Clay (Kdr) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Georgetown Formation Georgetown Formation (Kg) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Cyclic and marine (undivided) informal cyclic and marine members, undivided (Kpcm) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Leached and collapsed (undivided) informal leached and collapsed members, undivided (Kplc) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Regional dense informal regional dense member (Kprd) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Grainstone informal grainstone member (Kkg) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kirschberg Evaporite Kirschberg Evaporite Member (Kkke) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Dolomitic informal dolomitic member (Kkd) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Burrowed informal burrowed member (Kkb) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Basal Nodular informal basal nodular member (Kkbn) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Cavernous informal cavernous hydrostratigraphic unit (Kgrc) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Camp Bullis informal Camp Bullis hydrostratigraphic unit (Kgrcb) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Upper evaporite informal upper evaporite hydrostratigraphic unit (Kgrue) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Fossiliferous informal fossiliferous hydrostratigraphic unit (Kgrf) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Lower evaporite informal lower evaporite hydrostratigraphic unit (Kgrle) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Bulverde informal Bulverde hydrostratigraphic unit (Kgrb) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Little Blanco informal Little Blanco hydrostratigraphic unit (Kgrlb) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Twin Sisters informal Twin Sisters hydrostratigraphic unit (Kgrts) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Doeppenschmidt informal Doeppenschmidt hydrostratigraphic unit (Kgrd) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Herff Falls informal Herff Falls hydrostratigraphic unit (Kgrhf) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Rust informal Rust hydrostratigraphic unit (Kgrr) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Honey Creek informal Honey Creek hydrostratigraphic unit (Kgrhc) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Hensell Sand Hensell Sand (Kheh) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Cow Creek Limestone Cow Creek Limestone (Kcccc) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Hammett Shale Hammett Shale (Khah) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Sycamore Sand Sycamore Sand (Ksys) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). GroupNm Name of the group the map unit belongs to. Producer defined. Taylor Taylor Group which includes the Pecan Gap Chalk (Kpg) Modified from Hill (1891), Imlay (1945), Whitney (1952), Lozo and Stricklin (1956), Stricklin and others (1971), Rose (1972), Stricklin and Smith (1973), Amsbury (1974), Inden (1974), Perkins (1974), Brown and others (1976), Clark and others (2009, 2013, 2014), Wierman and others (2010), Blome and Clark (2014), Hunt and others (2015), Rose (2017), and U.S. Geological Survey National Geologic Map Database GEOLEX, (http://ngmb.usgs.gov/Geolex/search). Austin Not subdivided in the study area Modified from Hill (1891), Imlay (1945), Whitney (1952), Lozo and Stricklin (1956), Stricklin and others (1971), Rose (1972), Stricklin and Smith (1973), Amsbury (1974), Inden (1974), Perkins (1974), Brown and others (1976), Clark and others (2009, 2013, 2014), Wierman and others (2010), Blome and Clark (2014), Hunt and others (2015), Rose (2017), and U.S. Geological Survey National Geologic Map Database GEOLEX, (http://ngmb.usgs.gov/Geolex/search). Eagle Ford Not subdivided in the study area Modified from Hill (1891), Imlay (1945), Whitney (1952), Lozo and Stricklin (1956), Stricklin and others (1971), Rose (1972), Stricklin and Smith (1973), Amsbury (1974), Inden (1974), Perkins (1974), Brown and others (1976), Clark and others (2009, 2013, 2014), Wierman and others (2010), Blome and Clark (2014), Hunt and others (2015), Rose (2017), and U.S. Geological Survey National Geologic Map Database GEOLEX, (http://ngmb.usgs.gov/Geolex/search). Washita Washita Group which includes the Buda Limestone (Kb), Del Rio Clay (Kdr), and Georgetown Formation (Kg).in the study area Modified from Hill (1891), Imlay (1945), Whitney (1952), Lozo and Stricklin (1956), Stricklin and others (1971), Rose (1972), Stricklin and Smith (1973), Amsbury (1974), Inden (1974), Perkins (1974), Brown and others (1976), Clark and others (2009, 2013, 2014), Wierman and others (2010), Blome and Clark (2014), Hunt and others (2015), Rose (2017), and U.S. Geological Survey National Geologic Map Database GEOLEX, (http://ngmb.usgs.gov/Geolex/search). Edwards Includes the Person and Kainer Formations. The Person Formation is further subdivided into the informal cyclic and marine members (undivided) (Kpcm), the informal leached and collapsed members (undivided) (Kplc), and the informal regional dense member (Kprd), The Kainer Formation is further subdivided into the informal grainstone member (Kkg), the Kirschberg Evaporite Member (Kkke), the informal dolomitic member (Kkd), the informal burrowed member (Kkb), and the informal basal nodular member (Kkbn) Modified from Hill (1891), Imlay (1945), Whitney (1952), Lozo and Stricklin (1956), Stricklin and others (1971), Rose (1972), Stricklin and Smith (1973), Amsbury (1974), Inden (1974), Perkins (1974), Brown and others (1976), Clark and others (2009, 2013, 2014), Wierman and others (2010), Blome and Clark (2014), Hunt and others (2015), Rose (2017), and U.S. Geological Survey National Geologic Map Database GEOLEX, (http://ngmb.usgs.gov/Geolex/search). Trinity Includes the upper member of the Glen Rose Limestone, the lower member of the Glen Rose Limestone, and the Pearsall Formation. The upper member of the Glen Rose Limestone is further subdivided into the cavernous hydrostratigraphic unit (Kgrc), the Camp Bullis hydrostratigraphic unit (Kgrcb), the upper evaporite hydrostratigraphic unit (Kgrue), the fossiliferous hydrostratigraphic unit (Kgrf), and the lower evaporite hydrostratigraphic unit (Kgrle); The lower member of the Glen Rose Limestone is further subdivided into the Bulverde hydrostratigraphic unit (Kgrb), the Little Blanco hydrostratigraphic unit (Kgrlb), the Twin Sisters hydrostratigraphic unit (Kgrts), the Doeppenschmidt hydrostratigraphic unit (Kgrd), the Herff Falls hydrostratigraphic unit (Kgrhf), the Rust hydrostratigraphic unit (Kgrr), and the Honey Creek hydrostratigraphic unit (Kgrhc); The Pearsall Formation is further subdivided into the Hensell Sand (Kheh), the Cow Creek Limestone (Kcccc), the Hammett Shale (Khah), and the Sycamore Sand (Ksys) Modified from Hill (1891), Imlay (1945), Whitney (1952), Lozo and Stricklin (1956), Stricklin and others (1971), Rose (1972), Stricklin and Smith (1973), Amsbury (1974), Inden (1974), Perkins (1974), Brown and others (1976), Clark and others (2009, 2013, 2014), Wierman and others (2010), Blome and Clark (2014), Hunt and others (2015), Rose (2017), and U.S. Geological Survey National Geologic Map Database GEOLEX, (http://ngmb.usgs.gov/Geolex/search). Formation Name of the corresponding formation for the map unit. Producer defined -9999 Map unit does not have a corresponding formation name. Producer defined Pecan Gap Chalk Not subdivided in the study area Modified from Hill (1892) and Stenzel (1938). Buda Limestone Not subdivided in the study area Modified from Adkins (1932) and Vaughan (1900a, b). Del Rio Clay Not subdivided in the study area Modified from Adkins (1932) and Vaughan (1900a, b). Georgetown Formation Not subdivided in the study area Modified from Adkins (1932) and Vaughan (1900a, b). Person Formation Includes informal cyclic and marine members (undivided) (Kpcm), informal leached and collapsed members (undivided) (Kplc), and the informal regional dense member (Kprd) Modified from Hill and Vaughan (1898), Rose (1972), and Maclay and Small (1976). Kainer Formation Includes the informal grainstone member (Kkg), the Kirschberg Evaporite Member (Kkke), the informal dolomitic member (Kkd), the informal burrowed member (Kkb), and the informal basal nodular member (Kkbn) Modified from Hill and Vaughan (1898), Rose (1972), and Maclay and Small (1976). Glen Rose Limestone Includes the upper member of the Glen Rose Limestone and the lower member of the Glen Rose Limestone The upper member of the Glen Rose Limestone includes the cavernous hydrostratigraphic unit (Kgrc), the Camp Bullis hydrostratigraphic unit (Kgrcb), the upper evaporite hydrostratigraphic unit (Kgrue), the fossiliferous hydrostratigraphic unit (Kgrf), and the lower evaporite hydrostratigraphic unit (Kgrle). The lower member of the Glen Rose Limestone includes the Bulverde hydrostratigraphic unit (Kgrb), the Little Blanco hydrostratigraphic unit (Kgrlb), the Twin Sisters hydrostratigraphic unit (Kgrts), the Doeppenschmidt hydrostratigraphic unit (Kgrd), the Herff Falls hydrostratigraphic unit (Kgrhf), the Rust hydrostratigraphic unit (Kgrr), and the Honey Creek hydrostratigraphic unit (Kgrhc) Modified from Hill (1888), Ross (1943), Clark and others (2019), and Blome and Clark (2014). Pearsall Formation Includes the Hensell Sand (Kheh), the Cow Creek Limestone (Kcccc), the Hammett Shale (Khah), and the Sycamore Sand (Ksys) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Member Formal or informal member name for each map unit within the project boundary. Producer Defined -9999 Map unit does not have a corresponding member name. Producer defined Cyclic and marine (undivided) informal cyclic and marine member, undivided (Kpcm) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Leached and collapsed (undivided) informal leached and collapsed member, undivided (Kplc) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Regional dense informal regional dense member (Kprd) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Grainstone informal grainstone member (Kkg) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Kirschberg Evaporite Member Kirschberg Evaporite Member (Kkke) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Dolomitic informal dolomitic member (Kkd) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Burrowed informal burrowed member (Kkb) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Basal nodular informal basal nodular member (Kkbn) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). upper member of the Glen Rose Limestone Includes the cavernous hydrostratigraphic unit (Kgrc), the Camp Bullis hydrostratigraphic unit (Kgrcb), the upper evaporite hydrostratigraphic unit (Kgrue), the fossiliferous hydrostratigraphic unit (Kgrf), and the lower evaporite hydrostratigraphic unit (Kgrle) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). lower member of the Glen Rose Limestone Includes the Bulverde hydrostratigraphic unit (Kgrb), the Little Blanco hydrostratigraphic unit (Kgrlb), the Twin Sisters hydrostratigraphic unit (Kgrts), the Doeppenschmidt hydrostratigraphic unit (Kgrd), the Herff Falls hydrostratigraphic unit (Kgrhf), the Rust hydrostratigraphic unit (Kgrr), and the Honey Creek hydrostratigraphic unit (Kgrhc) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Hensell Sand Member Hensell Sand (Kheh) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Cow Creek Limestone Member Cow Creek Limestone (Kcccc) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Hammett Shale Member Hammett Shale (Khah) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Sycamore Sand Sycamore Sand (Ksys) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Hydro_Unit Defines to which hydrologic unit the map unit belongs to. Producer defined Upper confining unit to the Edwards aquifer The upper confining unit to the Edwards Aquifer that contains the Taylor, Austin, and Eagle Ford Groups and the Buda Limestone and Del Rio Clay of the Washita Group Modified from Maclay and Small (1976) and Ashworth (1983) Edwards aquifer A karst aquifer contained in the Georgetown Formation of the Washita Group and the Edwards Group. Modified from Maclay and Small (1976) and Ashworth (1983) Upper zone of the Trinity aquifer The upper section of the Trinity aquifer that contains the upper member of the Trinity Group Modified from Maclay and Small (1976) and Ashworth (1983) Middle zone of the Trinity aquifer Middle section of the Trinity aquifer that contains the lower member of the Trinity Group and the Hensell Sand and Cow Creek Limestone Members of the Pearsall Formation. Modified from Maclay and Small (1976) and Ashworth (1983) Confining unit of the Trinity aquifer Confining unit of the Trinity aquifer that contains the Hammett Shale of the Pearsall Formation Modified from Maclay and Small (1976) and Ashworth (1983) Lower zone of the Trinity aquifer Lower section of the Trinity aquifer that contains the Sycamore Sand member of the Hosston Formation. Modified from Maclay and Small (1976) and Ashworth (1983) Hydrostrat Hydrostratigraphic unit name for map units within the project boundary. Producer defined Pecan Gap Pecan Gap Chalk (Kpg) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Austin Austin Group (Ka) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Eagle Ford Eagle Ford Group (Kef) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Buda Buda Limestone (Kb) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Del Rio Del Rio Clay (Kdr) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). I Georgetown Formation (Kg) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). II informal cyclic and marine members, undivided (Kpcm) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). III informal leached and collapsed members, undivided (Kplc) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). IV informal regional dense member (Kprd) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). V informal grainstone member (Kkg) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). VI Kirschberg Evaporite Member (Kkke) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). VII informal dolomitic member (Kkd) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Seco Pass informal burrowed member (Kkb) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). VIII informal basal nodular member (Kkbn) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). cavernous informal cavernous hydrostratigraphic unit (Kgrc) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Camp Bullis informal Camp Bullis hydrostratigraphic unit (Kgrcb) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). upper evaporite informal upper evaporite hydrostratigraphic unit (Kgrue) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). fossiliferous informal fossiliferous hydrostratigraphic unit (Kgrf) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). lower evaporite informal lower evaporite hydrostratigraphic unit (Kgrle) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Bulverde informal Bulverde hydrostratigraphic unit (Kgrb) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Little Blanco informal Little Blanco hydrostratigraphic unit (Kgrlb) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Twin Sisters informal Twin Sisters hydrostratigraphic unit (Kgrts) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Doeppenschmidt informal Doeppenschmidt hydrostratigraphic unit (Kgrd) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Herff Falls informal Herff Falls hydrostratigraphic unit (Kgrhf) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Rust informal Rust hydrostratigraphic unit (Kgrr) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Honey Creek informal Honey Creek hydrostratigraphic unit (Kgrhc) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Hensell Hensell Sand (Kheh) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Cow Creek Cow Creek Limestone (Kcccc) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Hammett Hammett Shale (Khah) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Sycamore Sycamore Sand (Ksys) Modified and expanded from Barnes (1981) and Clark and others (2016a; b). Thickness Range of thickness in feet for the map unit. Clark and others (2009, 2014) and Wierman and others (2010). 0 540 feet 1 Hydro_Func Hydrologic unit type based on function. Producer defined Aquifer Hydrologic unit(s) that are permeable and allow the movement of water. Modified from Clark and others (2009, 2013, 2014), Wierman and others (2010), and Clark and Morris (2015). Confining unit Hydrologic unit(s) that are less permeable and restrict the movement of water. Modified from Clark and others (2009, 2013, 2014), Wierman and others (2010), and Clark and Morris (2015). Aquifer (locally where connected to the Edwards aquifer), confining unit otherwise Hydrologic unit(s) that are less permeable and restrict the movement of water except in areas locally connected to the Edwards aquifer. Modified from Clark and others (2009, 2013, 2014), Wierman and others (2010), and Clark and Morris (2015). Aquifer in area with caves; confining unit otherwise Hydrologic unit(s) that are permeable and allow the movement of water except in areas without caves. Modified from Clark and others (2009, 2013, 2014), Wierman and others (2010), and Clark and Morris (2015). Semi-confining unit Hydrologic unit(s) that are partially permeable and allow for some movement of water. Modified from Clark and others (2009, 2013, 2014), Wierman and others (2010), and Clark and Morris (2015). Semi-confining unit; confining shale beds Hydrologic unit(s) that are partially permeable and allow for some movement of water and include confining shale beds. Modified from Clark and others (2009, 2013, 2014), Wierman and others (2010), and Clark and Morris (2015). Porosity Description of the type of porosity for each map unit. Porosity types are defined as fabric selective or not fabric selective. If the map unit contained multiple types of porosity, the individual porosity codes were separated with a comma. Producer defined None Negligible amounts of interparticle and (or) intergranular porosities Modified from Choquette and Pray (1970) IP Interparticle porosity (fabric selective) Modified from Choquette and Pray (1970) IG Intergranular porosity (fabric selective) Modified from Choquette and Pray (1970) MO Moldic porosity (fabric selective) Modified from Choquette and Pray (1970) BU Burrowed porosity (fabric selective) Modified from Choquette and Pray (1970) BP Bedding plane porosity (fabric selective) Modified from Choquette and Pray (1970) FR Fracture porosity (not-fabric selective) Modified from Choquette and Pray (1970) CH Channel porosity (not-fabric selective) Modified from Choquette and Pray (1970) BR Breccia porosity (not-fabric selective) Modified from Choquette and Pray (1970) VUG Vug porosity (not-fabric selective) Modified from Choquette and Pray (1970) CV Cave porosity (not-fabric selective) Modified from Choquette and Pray (1970) IC Intercrystalline porosity (fabric selective) Modified from Choquette and Pray (1970) occasional CV Cave porosity (not-fabric selective) on an occasional basis Modified from Choquette and Pray (1970) SH Shelter porosity (fabric selective) Choquette and Pray (1970) FieldID General description of map unit characteristics for field identification. Producer defined Map unit descriptors and characteristics based on field observations. Shape_Leng Length of feature in internal units. Esri 45.68629 105803.01382 meters 0.00001 Shape_Area Area of feature in internal units squared. Esri 34.91836 27042632.70110 square meters 0.00001 Hays_Lns Folder containing a collection of files with a common filename prefix (Hays_Lns) associated with the feature class (shapefile; .shp) containing contact, fault, and boundary. Producer Defined FID (also labeled as OBJECTID) Sequential unique whole numbers that are automatically generated for each feature. Esri 0 2805 unitless 1 Shape Feature geometry or shape type. Esri Polyline An ordered set of coordinate vertices representing a line or boundary. Esri Type Identifiers for each line feature. Producer Defined boundary Artificial boundary marking the edge of the mapped area. Producer defined contact-certain Hydrostratigraphic map unit contact line segment. Producer defined Corbula bed Line segment designating location of the Corbula marker bed. Producer defined Loriolia bed Line segment designating location of the Loriolia marker bed. Producer defined fault-certain Fault line segment. Producer defined fault-inferred Inferred fault line segment. Producer defined Shape_Leng Length of feature in internal units. Esri 23.29224 160981.24785 meters 0.00001 Hays_Geo.lyrx An Esri layer file containing the same information in the Hays_Geo feature class. Producer Defined U.S. Geological Survey GS ScienceBase mailing and physical

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